Welcome to the club!!!! Polyamory hit us very much the same way. We attempted in many ways to find like minded friends but this was difficult. I can assure you that Pittsburgh does NOT have a large organized and active poly community, though there are many poly folks here. We recently learned the importance of a supportive poly community so we are willing to drive to meet people and attend meetings. Anyone anywhere from the middle of PA to the middle of Ohio that is interested in creating such a community, please message us. We need to find and also to give support in this lifestyle.
Best of luck to everyone on their relationships and searching.